Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 975 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
3. 3.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
4. 4.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) in opposite directions (d) they do not turn
5. 5.⚙️ An 8-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
6. 6.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 1 (d) 4
7. 7.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
9. 9.True or false: to read a QR code, use a touch sensor. (a) False (b) True
10. 10.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
11. 11.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🧭 A robot faces west. It does: turn right, turn around. Which way does it face now? (a) north (b) south (c) west (d) east
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
14. 14.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 39. What is under the sensor? (a) the black line (b) the white floor
15. 15.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
17. 17.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
18. 18.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
19. 19.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) tyre (d) driven gear
20. 20.🛞 Circumference = π × … (a) weight (b) diameter (c) speed (d) radius only
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are round (c) they are shiny (d) they spin in the air
24. 24.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
25. 25.⚙️ A motor makes 180 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
26. 26.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
28. 28.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a temperature sensor (c) a touch sensor (d) a camera
29. 29.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
30. 30.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22/7 (d) 22
31. 31.True or false: “stepping over wide gaps” suits legs. (a) False (b) True
32. 32.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 180° (d) 360°
33. 33.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns right 30°, then right 60°, then left 45°. What does the gyro read now (0° to 359°)?
34. 34.Which job needs a distance sensor? (a) follow a black line (b) stay balanced upright (c) measure how far a box is (d) read a QR code
35. 35.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.🔍 Which sensor helps a robot stay balanced upright? (a) a temperature sensor (b) a light sensor (c) a gyro sensor (d) a camera
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) turns right (b) stays still (c) spins left on the spot (d) turns left
38. 38.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
39. 39.🧭 A robot spins 15° every second. How many seconds does it take to turn 105°?
40. 40.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes

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